$ git clone -n https://src.fedoraproject.org/rpms/perl-XML-TreePP.git /var/lib/mock/f45-build-27594-625/root/chroot_tmpdir/scmroot/perl-XML-TreePP
Cloning into '/var/lib/mock/f45-build-27594-625/root/chroot_tmpdir/scmroot/perl-XML-TreePP'...
$ git fetch origin 218516d5a92fd881f201acb77da85fff965bb8d2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-XML-TreePP
 * [new ref]         218516d5a92fd881f201acb77da85fff965bb8d2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 218516d Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild